Yates Insecticide Ready to Use Scale Gun Spray is prevents fungal diseases such as Leaf curl of peaches and nectarines and leaf spot and rust on ornamentals and vegetables. Prevents diseases entering into the plant. Controls leaf curl in peaches and nectarines. Also controls common diseases on vegetables and black spot on roses. Prevents entry of fungus into the plant. When sprayed thoroughly, it creates a surface barrier to fungal infestation. As with most fungicides, thorough spraying is important to form a total barrier to disease. It comes in 750 ml pack.